#' Animal visual systems data
#'
#' Internal data for visual model calculations.
#'
#' @name vissyst
#' @docType data
#' @author Rafael Maia \email{rm72@@zips.uakron.edu}
#' @references Endler, J. A., & Mielke, P. (2005). Comparing entire colour
#'   patterns as birds see them. Biological Journal Of The Linnean Society,
#'   86(4), 405-431.
#' @keywords data internal
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